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PlantFiles: Canadian Horseweed, Fleabane, Hogweed
Conyza canadensis

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Conyza (kon-NY-zuh) (Info)
Species: canadensis (ka-na-DEN-sis) (Info)

Synonym:Erigeron canadensis
Synonym:Leptilon canadense


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

24-36 in. (60-90 cm)

Not Applicable

Sun Exposure:
Full Sun

Handling plant may cause skin irritation or allergic reaction

Bloom Color:
White/Near White

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall


Other details:
May be a noxious weed or invasive
This plant is attractive to bees, butterflies and/or birds
Drought-tolerant; suitable for xeriscaping
Average Water Needs; Water regularly; do not overwater
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow after last frost

Seed Collecting:
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds
Properly cleaned, seed can be successfully stored

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By Floridian
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There are a total of 8 photos.
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1 positive
1 neutral
3 negatives

Gardeners' Notes:

Neutral lincoln8 On Mar 18, 2015, lincoln8 from Gerald, MO wrote:

just found out this is useful in ulcerative colitis/ referenced in Michael moore and Micheal Alfs

Negative tcs1366 On Jul 1, 2009, tcs1366 from Leesburg, FL (Zone 9b) wrote:

I pull this plant out by the bushel full every year... it just keeps coming back. Only good thing is, it's easy to pull out, even in my rock hard soil.

Negative melody On Jan 3, 2005, melody from Benton, KY (Zone 7a) wrote:

This weed has an amazing ability to flourish and set seed in just about any conditions.

It ranges from nearly 10 feet tall in loamy bottom land to just a few inches high on rocky abandoned lots. In both cases, it sets vast amounts of seeds and is virtually indestructable.

It is invasive and as far as I know, livestock avoid it.

Negative xyris On Nov 2, 2004, xyris from Sebring, FL (Zone 9b) wrote:

Can we accept that some weeds have little to no garden value? I think this is one of them. I find it growing abundantly only in disturbed areas, and is one of those weeds that is impossible to keep out of a sandy soil garden (and probably other soil types).

Positive cityboy On Oct 27, 2004, cityboy from ft. worth, TX (Zone 8a) wrote:

Grows well without human intervention. Best planted as a group.


This plant has been said to grow in the following regions:

Phoenix, Arizona
Morrilton, Arkansas
Chula Vista, California
Sebring, Florida
Anna, Illinois
Itasca, Illinois
Benton, Kentucky
Brookeville, Maryland
Pinconning, Michigan
Pawling, New York
Battleboro, North Carolina
Terrebonne, Oregon

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